Product Overview
The Allen-Bradley 1747-L553 is a high-performance SLC 5/05 processor from the SLC 500 PLC family. It delivers the largest memory capacity in its series, with 64 KB of battery-backed RAM, making it ideal for complex medium-to-large-scale automation tasks. The 1747-L553 integrates both Ethernet and RS-232 communication ports, enabling flexible connectivity for HMI, programming, and peer-to-peer networking.
Engineered for reliability, the 1747-L553 supports up to 4096 inputs and 4096 outputs, along with 480 local analog I/O channels. Its advanced instruction set, based on PLC-5 architecture, handles discrete, analog, and motion control applications with ease. Whether used in factory automation, process control, or SCADA systems, this processor ensures robust and responsive operation.
Technical Specifications
| Parameter |
Value |
| Manufacturer |
Rockwell Automation |
| Brand |
Allen-Bradley |
| Part Number |
1747-L553 |
| Series |
SLC 500 |
| Module Type |
SLC 5/05 Processor |
| Inputs |
4096 |
| Outputs |
4096 |
| Analog I/O |
480 |
| User Memory |
64,000 Words |
| Memory Type |
Battery-Backed RAM (up to 64 KB) |
| Program Scan Time |
0.9 ms/K |
| I/O Scan Time |
0.225 ms |
| I/O Chassis |
3 |
| Chassis Module Slots |
30 |
| Communication |
Ethernet, RS-232 |
| Backup Memory |
1747-M13 |
| Ambient Temperature |
0 to 60 °C |
| Battery Backup |
Yes (1747-BA) |
Key Features & Benefits
-
High Memory Capacity: 64,000 words of user memory, ideal for large, data-intensive programs.
-
Dual Communication Ports: Integrated Ethernet (10/100 Mbps) and RS-232 for simultaneous, high-speed data exchange.
-
Extensive I/O Support: Up to 4096 discrete inputs and outputs, plus 480 analog I/O channels.
-
Fast Processing: 0.9 ms/K program scan time and 0.225 ms I/O scan time ensure real-time control.
-
Flexible Expansion: Supports up to 3 local chassis with 30 slots, and optional Remote I/O and DeviceNet scanner modules.
-
Battery-Backed RAM: Maintains program and data integrity during power loss.
Industry Applications
The Allen-Bradley 1747-L553 excels in demanding automation environments. In factory automation, it coordinates high-speed discrete operations, such as assembly lines and packaging systems, where its fast scan times and large I/O capacity minimize cycle delays. In process automation, the processor handles analog loops and complex control algorithms, ensuring precise temperature, pressure, and flow regulation.
For SCADA systems, the 1747-L553 can operate as a remote terminal unit, communicating via Ethernet to central control rooms. Its RS-232 port also supports direct connection to HMIs and programming terminals, simplifying commissioning and maintenance. The processor's ability to message other Allen-Bradley platforms (PLC-5, CompactLogix, ControlLogix) makes it a versatile choice for multi-vendor plants.
Installation & Setup
Install the 1747-L553 into any SLC 500 chassis, always in slot 0. Ensure the backplane power supply meets the module's current requirements (1 A @ 5 VDC). Connect the Ethernet port to a switch or directly to a programming terminal; use the RS-232 port for local HMI or programming. For remote I/O or DeviceNet networks, install the appropriate scanner modules. Verify the battery (1747-BA) is installed and charged before first use.
Maintenance & Reliability
Regularly inspect the battery voltage and replace it every 2-3 years to prevent memory loss. Keep the module's air vents clean and ensure ambient temperature stays within 0-60 °C. Check Ethernet cable connections for wear and secure seating. The 1747-L553's rugged design withstands 30G shock, but avoid prolonged exposure to moisture or corrosive gases.
Compatibility & Integration
The 1747-L553 integrates seamlessly with the SLC 500 platform and supports various communication protocols, including Ethernet/IP, RS-232, and optional modules for Remote I/O, DH+, DeviceNet, and DH485. It can exchange messages with PLC-5, CompactLogix, and ControlLogix controllers. Use the 1761-NET-AIC converter for RS-232 to DH-485 conversion when needed.
Buying Guide
Before purchasing, verify your system's power supply capacity and chassis slot availability. Confirm the required communication interfaces and I/O configuration. For critical applications, consider a spare battery (1747-BA) and a backup memory module (1747-M13). PLC Source PRO offers genuine Allen-Bradley 1747-L553 processors with fast shipping and reliable support.